Evenin` all. We have just aquired some polycarb sheet and would like to make a windscreen. I`ve been told that it needs "drying" first before its formed to get rid of bubbles? How critical is this, and does it need to be done? Thankyou for any expertise!

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Evenin` all. We have just aquired some polycarb sheet and would like to make a windscreen. I`ve been told that it needs "drying" first before its formed to get rid of bubbles? How critical is this, and does it need to be done? Thankyou for any expertise!

Yes, correct it does,check out Arla website Sweden for correct temps and timing for Drying,(something like 1 hour per mm@100 degC) as it is hygroscopic, meaning it absorbs moisture. You would be better using PETG which is equally as good, approx 80% of PC strength, easier to work with as well, and does not require drying.
Try Barkston Plastics in Leeds 0113-2492222, Steve Rock
Hope this helps

Phew what a read! Thanks Madmat, we`ll just have to have a go with the scrap first. Will take pics to let you know how we get on.

I was involved in making some screens for lambretta scooters recently using acrylic, nice shapes, what is called press forming, we heat sheet under a sheet heater, and press with tooling, if you ever see a helicopter pilots screen cover ( black) on helmet we make them as well, as you probably guessed I work with plastics, vacforming,press forming any probs or help required contact me.